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HTML 

              
                <body>
  <div id='map'></div>
  <script src='https://d3js.org/d3.v3.min.js' charset="utf-8"></script>
  <script src="https://d3js.org/topojson.v1.min.js" charset="utf-8"></script>
  <script src='https://polyshrink.s3.amazonaws.com/polymorph.js' charset='utf-8'></script>
  <script src="https://polyshrink.s3.amazonaws.com/countries.js"></script>
</body>
!

CSS 

              
                body,html,svg,div#map {
  width: 100%;
  height: 100%;
  padding: 0px;
  margin: 0px;
  overflow: hidden;
}
body {
  background-color: #2D2F30;
}
!

JS 

              
                pageWidth = window.innerWidth
pageHeight = window.innerHeight
proj = new d3.geo.mercator!
  .center [-105,51] 
  .rotate [0,0,0]
  .translate [(pageWidth/2),pageHeight/2] 
  .scale 1 .<<. 8  

zoomed = ->
  transform = "translate(#{zoom.translate!}) scale(#{zoom.scale!})"
  d3.select 'svg#map-canvas g'
    .attr 'transform', transform
    .selectAll 'path'
    .style 'stroke-width', -> 3 / zoom.scale!

zoom = new d3.behavior.zoom!on 'zoom', zoomed

g = d3.select 'div#map'
  .append 'svg'
  .attr 'id', 'map-canvas'
  .call zoom
  .append 'g'

path = d3.geo.path().projection(proj) # Path generating function

# Transpose a shape onto a circle
circleIt = (it,x,y,r) ->
  from = path it # The coastline boundary
  # A simple circle path of two arcs
  circle = "m #{x - r} #y 
    a #r #r 0 1 0 #{2*r} 0 
    a #r #r 0 1 0 #{-2*r} 0"
  polymorph.transpose from, circle

randomCircle = ->
    p = 20 # padding
    w = pageWidth - (2 * p)
    h = pageHeight - (2 * p)
    x = (Math.random! * w) + p
    y = (Math.random! * h) + p
    r = (Math.log it.properties.AREA) * 3
    circleIt it, x, y, r
  
colours =
  Canada: '#CACACA'
  Mexico: '#8C8787'
  'United States': '#4E4E4E'
  
cstGeoJson = topojson.feature countries,countries.objects.countries

g.selectAll 'path'
  .data cstGeoJson.features.filter -> # Let's be selective
    name = it.properties.name
    area = it.properties.AREA # Filter out small island
    reg = /(Canada|Mexico|United States)/ # Only NA for now
    if name.match reg and area > 1 then yes else no
  .enter!
  .append 'path'
  .attr 'd', randomCircle
  .style 'fill', -> colours[it.properties.name]

toDots = ->
  l = d3.selectAll('path')[0].length
  i = 1
  d3.selectAll 'path'
    .transition!
    .delay -> Math.random! * 1000
    .duration 5000
    .attr 'd', randomCircle
    .each 'end', -> toCountries! if l is i++
  
toCountries = ->
  l = d3.selectAll('path')[0].length
  i = 1
  d3.selectAll 'path'
    .transition!
    .delay -> Math.random! * 1000
    .duration 5000
    .attr 'd', path
    .each 'end', -> toDots! if l is i++

toCountries!
!
999px

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